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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Copyright 2008 Les Hazlewood Licensed under the Apache License, Version 2.0 (the "License"); you may not use this<a name="line.2"></a>
<FONT color="green">003</FONT>     * file except in compliance with the License. You may obtain a copy of the License at<a name="line.3"></a>
<FONT color="green">004</FONT>     * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software<a name="line.4"></a>
<FONT color="green">005</FONT>     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,<a name="line.5"></a>
<FONT color="green">006</FONT>     * either express or implied. See the License for the specific language governing permissions and limitations under the<a name="line.6"></a>
<FONT color="green">007</FONT>     * License.<a name="line.7"></a>
<FONT color="green">008</FONT>     */<a name="line.8"></a>
<FONT color="green">009</FONT>    package org.codemonkey.simplejavamail;<a name="line.9"></a>
<FONT color="green">010</FONT>    <a name="line.10"></a>
<FONT color="green">011</FONT>    import java.util.regex.Pattern;<a name="line.11"></a>
<FONT color="green">012</FONT>    <a name="line.12"></a>
<FONT color="green">013</FONT>    /**<a name="line.13"></a>
<FONT color="green">014</FONT>     * Validates an email address according to &lt;a href="http://www.ietf.org/rfc/rfc2822.txt"&gt;RFC 2822&lt;/a&gt;, using regular expressions.<a name="line.14"></a>
<FONT color="green">015</FONT>     * &lt;p&gt;<a name="line.15"></a>
<FONT color="green">016</FONT>     * From the original author: &lt;br /&gt;<a name="line.16"></a>
<FONT color="green">017</FONT>     * &lt;blockquote&gt; If you use this code, please keep the author information in tact and reference my site at &lt;a<a name="line.17"></a>
<FONT color="green">018</FONT>     * href="http://www.leshazlewood.com"&gt;leshazlewood.com&lt;/a&gt;. Thanks! &lt;/blockquote&gt;<a name="line.18"></a>
<FONT color="green">019</FONT>     * &lt;p&gt;<a name="line.19"></a>
<FONT color="green">020</FONT>     * Code sanitized by Benny Bottema (kept validation 100% in tact).<a name="line.20"></a>
<FONT color="green">021</FONT>     * <a name="line.21"></a>
<FONT color="green">022</FONT>     * @author Les Hazlewood, Benny Bottema<a name="line.22"></a>
<FONT color="green">023</FONT>     * @see EmailAddressValidationCriteria<a name="line.23"></a>
<FONT color="green">024</FONT>     */<a name="line.24"></a>
<FONT color="green">025</FONT>    public final class EmailValidationUtil {<a name="line.25"></a>
<FONT color="green">026</FONT>    <a name="line.26"></a>
<FONT color="green">027</FONT>            /**<a name="line.27"></a>
<FONT color="green">028</FONT>             * Private constructor; this is a utility class with static methods only, not designed for extension.<a name="line.28"></a>
<FONT color="green">029</FONT>             */<a name="line.29"></a>
<FONT color="green">030</FONT>            private EmailValidationUtil() {<a name="line.30"></a>
<FONT color="green">031</FONT>                    //<a name="line.31"></a>
<FONT color="green">032</FONT>            }<a name="line.32"></a>
<FONT color="green">033</FONT>    <a name="line.33"></a>
<FONT color="green">034</FONT>            /**<a name="line.34"></a>
<FONT color="green">035</FONT>             * Validates an e-mail with default validation flags that remains &lt;code&gt;true&lt;/code&gt; to RFC 2822. This means allowing both domain<a name="line.35"></a>
<FONT color="green">036</FONT>             * literals and quoted identifiers.<a name="line.36"></a>
<FONT color="green">037</FONT>             * <a name="line.37"></a>
<FONT color="green">038</FONT>             * @param email A complete email address.<a name="line.38"></a>
<FONT color="green">039</FONT>             * @return Whether the e-mail address is compliant with RFC 2822.<a name="line.39"></a>
<FONT color="green">040</FONT>             * @see EmailAddressValidationCriteria#EmailAddressValidationCriteria(boolean, boolean)<a name="line.40"></a>
<FONT color="green">041</FONT>             */<a name="line.41"></a>
<FONT color="green">042</FONT>            public static boolean isValid(final String email) {<a name="line.42"></a>
<FONT color="green">043</FONT>                    return isValid(email, new EmailAddressValidationCriteria(true, true));<a name="line.43"></a>
<FONT color="green">044</FONT>            }<a name="line.44"></a>
<FONT color="green">045</FONT>    <a name="line.45"></a>
<FONT color="green">046</FONT>            /**<a name="line.46"></a>
<FONT color="green">047</FONT>             * Validates an e-mail with given validation flags.<a name="line.47"></a>
<FONT color="green">048</FONT>             * <a name="line.48"></a>
<FONT color="green">049</FONT>             * @param email A complete email address.<a name="line.49"></a>
<FONT color="green">050</FONT>             * @param emailAddressValidationCriteria A set of flags that restrict or relax RFC 2822 compliance.<a name="line.50"></a>
<FONT color="green">051</FONT>             * @return Whether the e-mail address is compliant with RFC 2822, configured using the passed in {@link EmailAddressValidationCriteria}.<a name="line.51"></a>
<FONT color="green">052</FONT>             * @see EmailAddressValidationCriteria#EmailAddressValidationCriteria(boolean, boolean)<a name="line.52"></a>
<FONT color="green">053</FONT>             */<a name="line.53"></a>
<FONT color="green">054</FONT>            public static boolean isValid(final String email, final EmailAddressValidationCriteria emailAddressValidationCriteria) {<a name="line.54"></a>
<FONT color="green">055</FONT>                    return buildValidEmailPattern(emailAddressValidationCriteria).matcher(email).matches();<a name="line.55"></a>
<FONT color="green">056</FONT>            }<a name="line.56"></a>
<FONT color="green">057</FONT>    <a name="line.57"></a>
<FONT color="green">058</FONT>            protected static Pattern buildValidEmailPattern(EmailAddressValidationCriteria parameterObject) {<a name="line.58"></a>
<FONT color="green">059</FONT>                    // RFC 2822 2.2.2 Structured Header Field Bodies<a name="line.59"></a>
<FONT color="green">060</FONT>                    final String wsp = "[ \\t]"; // space or tab<a name="line.60"></a>
<FONT color="green">061</FONT>                    final String fwsp = wsp + "*";<a name="line.61"></a>
<FONT color="green">062</FONT>                    // RFC 2822 3.2.1 Primitive tokens<a name="line.62"></a>
<FONT color="green">063</FONT>                    final String dquote = "\\\"";<a name="line.63"></a>
<FONT color="green">064</FONT>                    // ASCII Control characters excluding white space:<a name="line.64"></a>
<FONT color="green">065</FONT>                    final String noWsCtl = "\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x7F";<a name="line.65"></a>
<FONT color="green">066</FONT>                    // all ASCII characters except CR and LF:<a name="line.66"></a>
<FONT color="green">067</FONT>                    final String asciiText = "[\\x01-\\x09\\x0B\\x0C\\x0E-\\x7F]";<a name="line.67"></a>
<FONT color="green">068</FONT>                    // RFC 2822 3.2.2 Quoted characters:<a name="line.68"></a>
<FONT color="green">069</FONT>                    // single backslash followed by a text char<a name="line.69"></a>
<FONT color="green">070</FONT>                    final String quotedPair = "(\\\\" + asciiText + ")";<a name="line.70"></a>
<FONT color="green">071</FONT>                    // RFC 2822 3.2.4 Atom:<a name="line.71"></a>
<FONT color="green">072</FONT>                    final String atext = "[a-zA-Z0-9\\!\\#\\$\\%\\&amp;\\'\\*\\+\\-\\/\\=\\?\\^\\_\\`\\{\\|\\}\\~]";<a name="line.72"></a>
<FONT color="green">073</FONT>                    final String atom = fwsp + atext + "+" + fwsp;<a name="line.73"></a>
<FONT color="green">074</FONT>                    final String dotAtomText = atext + "+" + "(" + "\\." + atext + "+)*";<a name="line.74"></a>
<FONT color="green">075</FONT>                    final String dotAtom = fwsp + "(" + dotAtomText + ")" + fwsp;<a name="line.75"></a>
<FONT color="green">076</FONT>                    // RFC 2822 3.2.5 Quoted strings:<a name="line.76"></a>
<FONT color="green">077</FONT>                    // noWsCtl and the rest of ASCII except the doublequote and backslash characters:<a name="line.77"></a>
<FONT color="green">078</FONT>                    final String qtext = "[" + noWsCtl + "\\x21\\x23-\\x5B\\x5D-\\x7E]";<a name="line.78"></a>
<FONT color="green">079</FONT>                    final String qcontent = "(" + qtext + "|" + quotedPair + ")";<a name="line.79"></a>
<FONT color="green">080</FONT>                    final String quotedString = dquote + "(" + fwsp + qcontent + ")*" + fwsp + dquote;<a name="line.80"></a>
<FONT color="green">081</FONT>                    // RFC 2822 3.2.6 Miscellaneous tokens<a name="line.81"></a>
<FONT color="green">082</FONT>                    final String word = "((" + atom + ")|(" + quotedString + "))";<a name="line.82"></a>
<FONT color="green">083</FONT>                    final String phrase = word + "+"; // one or more words.<a name="line.83"></a>
<FONT color="green">084</FONT>                    // RFC 1035 tokens for domain names:<a name="line.84"></a>
<FONT color="green">085</FONT>                    final String letter = "[a-zA-Z]";<a name="line.85"></a>
<FONT color="green">086</FONT>                    final String letDig = "[a-zA-Z0-9]";<a name="line.86"></a>
<FONT color="green">087</FONT>                    final String letDigHyp = "[a-zA-Z0-9-]";<a name="line.87"></a>
<FONT color="green">088</FONT>                    final String rfcLabel = letDig + "(" + letDigHyp + "{0,61}" + letDig + ")?";<a name="line.88"></a>
<FONT color="green">089</FONT>                    final String rfc1035DomainName = rfcLabel + "(\\." + rfcLabel + ")*\\." + letter + "{2,6}";<a name="line.89"></a>
<FONT color="green">090</FONT>                    // RFC 2822 3.4 Address specification<a name="line.90"></a>
<FONT color="green">091</FONT>                    // domain text - non white space controls and the rest of ASCII chars not including [, ], or \:<a name="line.91"></a>
<FONT color="green">092</FONT>                    final String dtext = "[" + noWsCtl + "\\x21-\\x5A\\x5E-\\x7E]";<a name="line.92"></a>
<FONT color="green">093</FONT>                    final String dcontent = dtext + "|" + quotedPair;<a name="line.93"></a>
<FONT color="green">094</FONT>                    final String domainLiteral = "\\[" + "(" + fwsp + dcontent + "+)*" + fwsp + "\\]";<a name="line.94"></a>
<FONT color="green">095</FONT>                    final String rfc2822Domain = "(" + dotAtom + "|" + domainLiteral + ")";<a name="line.95"></a>
<FONT color="green">096</FONT>                    final String domain = parameterObject.isAllowDomainLiterals() ? rfc2822Domain : rfc1035DomainName;<a name="line.96"></a>
<FONT color="green">097</FONT>                    final String localPart = "((" + dotAtom + ")|(" + quotedString + "))";<a name="line.97"></a>
<FONT color="green">098</FONT>                    final String addrSpec = localPart + "@" + domain;<a name="line.98"></a>
<FONT color="green">099</FONT>                    final String angleAddr = "&lt;" + addrSpec + "&gt;";<a name="line.99"></a>
<FONT color="green">100</FONT>                    final String nameAddr = "(" + phrase + ")?" + fwsp + angleAddr;<a name="line.100"></a>
<FONT color="green">101</FONT>                    final String mailbox = nameAddr + "|" + addrSpec;<a name="line.101"></a>
<FONT color="green">102</FONT>                    // now compile a pattern for efficient re-use:<a name="line.102"></a>
<FONT color="green">103</FONT>                    // if we're allowing quoted identifiers or not:<a name="line.103"></a>
<FONT color="green">104</FONT>                    final String patternString = parameterObject.isAllowQuotedIdentifiers() ? mailbox : addrSpec;<a name="line.104"></a>
<FONT color="green">105</FONT>                    return Pattern.compile(patternString);<a name="line.105"></a>
<FONT color="green">106</FONT>            }<a name="line.106"></a>
<FONT color="green">107</FONT>    }<a name="line.107"></a>




























































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